signed and dated 'Bertina/ 97' (lower right); inscribed 'olio su tela/ cm 140 x 160/ 1997/ Bertina 97/ Tanti auguri/ Gustavo/ Bertina (mama B) & Franco/ 1997/ Titolo "La vita/ una eruzione vulca-/nica' and bears an exhibition label (verso); numbered '23' (verso of stretcher)